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In order to solve the problems of fixed speed, single-way conveying, conveying speed and loom speed mismatch of knitting machine elastic belt conveying device, a design scheme of multi-line rubber band conveying control system based on I2C (Inter-Integrated Circuit) communication is proposed. The scheme realizes the real-time communication between the control host and the PWM (Pulse Width Modulation) signal output slave through the I2C bus communication of the master-slave MCU. The slave machine controls the stepper motor through the subdivision circuit and the drive circuit, and uses the stepping motor to speed up and down the differential. Algorithm and speed matching algorithm to realize multi-speed variable speed elastic belt conveyor control system with good speed matching. At the same time, because I2C bus has easy scalability, it can realize multi-channel through bus analog communication and expansion between MCU I/O ports. delivery. Finally, by setting up simulation experiments, it is verified that the speed matching between the stepping motor and the knitting machine needle is better. When the stepping motor driver (TB6600) is 32 subdivided and the duty ratio of the PWM signal is 60%, the motor The speed is stable, the vibration is small, and the system noise is low. The system can play a positive role in improving fabric tightness, improving fabric production efficiency and adjusting fabric morphology.